Special reactions. --

* * * * *

Mineral. Chromic iron

Formula. [.Fe][...Cr=].

Behavior

(1) in glass-bulb. --

(2) in open tube. --

(3) on charcoal. --

(4) in forceps. As the preceding.

(5) in borax. Dissolves slowly and gives the chromium
reaction.

(6) in mic. salt. As in borax.

(7) with carb. soda. On platinum foil with nitre and carbonate of
soda affords a yellow mass of chromate of
potassa.

(8) Special reactions. --

* * * * *

Mineral. Lievrite

Formula. 3([.Fe][.Ca])^{3}[...Si] + 2[...Fe=][...Si].

Behavior

(1) in glass-bulb. Occasionally gives off some water and turns
black.

(2) in open tube. --

(3) on charcoal. Fuses to a black globule, which in the reducing
flame becomes magnetic.

(4) in forceps. I. In reducing flame is magnetic.

(5) in borax. Gives the iron reaction.

(6) in mic. salt. Gives the iron and silica reactions.

(7) with carb. soda. Fuses to a black opaque bead.

(8) Special reactions. Generally gives the manganese reaction with
nitre and carbonate of soda.

* * * * *

Mineral. Chloropal

Formula. [...Fe=][...Si]^{2} + 3[.H].

Behavior

(1) in glass-bulb. Decrepitates more or less, gives off much water
and turns black.

(2) in open tube. --

(3) on charcoal. --

(4) in forceps. V. Loses color and turns black.

(5) in borax. Gives the iron reaction.

(6) in mic. salt. Gives the iron and silica reaction.

(7) with carb. soda. Fuses to a transparent green glass.

(8) Special reactions. --

* * * * *

Mineral. Green earth

Formula. [...Si],[.Fe],[...Al=],[.Na],[.K],[.H], etc.

Behavior

(1) in glass-bulb. Gives off water and becomes darker in color.

(2) in open tube. --

(3) on charcoal. --

(4) in forceps. V. In reducing flame fuses on edges and colors
the outer flame yellow ([.Na]) or violet ([.K